Fix bug in rust-indent-method-chains

Author: MicahChalmer

rust-mode-tests.el

@@ -1012,3 +1012,12 @@ fn main() {
 }
 "
    )))
+
+(ert-deftest indent-method-chains-after-comment ()
+  (let ((rust-indent-method-chain t)) (test-indent
+   "
+fn main() { // comment here should not push next line out
+    foo.bar()
+}
+"
+   )))

rust-mode.el

@@ -131,7 +131,7 @@
           ;;
           ((skip-dot-identifier
             (lambda ()
-              (when (looking-back (concat "\." rust-re-ident))
+              (when (looking-back (concat "\\." rust-re-ident))
                 (backward-word 1)
                 (backward-char)
                 (- (current-column) rust-indent-offset)))))